Flywheel Removal on 1968 9.8HP Merc 110

[dads110]

I want to remove the flywheel to check out the points, etc under it. Why, you say #1 cylinder fires, but #2 doesn't. Checked the spark plugs already and they're fine. I thought I would check the obvious, if I could and if the answer doesn't jump out at me, take the motor to a shop. I'm am hoping it isn't the coil for #2 <br /><br />I figured an impact tool would remove the crank shaft nut, but pulling the flywheel???<br /><br />I don't want to damage anything, so what is the accepted practice...probably not a hammer and pry bar, huh <br /><br />Thanks

 

[Chinewalker]

Re: Flywheel Removal on 1968 9.8HP Merc 110

You need to borrow/acquire a 3-point puller, often called a harmonic balancer puller. Available at Sears, NAPA, etc. Also get appropriate bolts to thread into the flywheel. Use the three holes surrounding the center of the flywheel. The threads will either be a 1/4"-28, or a 5/16"-24.<br /><br />Remove the flywheel nut and install the puller. Snug up the bolts, making sure they're at least 4-5 turns into the flywheel so you don't pull the threads out. Then, tighten down on the center puller bolt. A good rap with a hammer on the center bolt may help pop it free. The crankshaft is tapered, so they can be on there pretty tight...<br /><br />- Scott

 

[dads110]

Re: Flywheel Removal on 1968 9.8HP Merc 110

Fantastic! Worked like a champ! BTW, the correct thread size was 5/16-24. I found no problems staring at me, so I cleaned the points and swapped the condensers (to see if my problem moved). Low and behold, I know have spark on both cylinders. Getting late, so tomorrow I will attempt to start the motor again, hopefully with more success.<br /><br />Aren't the 1000 Islands in the Adirondacks? We are new to Rochester and hope to get over their sometime in the near future.

 

[Chinewalker]

Re: Flywheel Removal on 1968 9.8HP Merc 110

1000 Islands and Adirondacks are two different regions. 1000 Islands are located at the confluence of Lake Ontario into the St. Lawrence River. Take the thruway east to I-81 north. Keep driving until you run out of road (on the U.S. side...)<br /><br />The Adirondacks are about 2 hours east of here.<br />- Scott

 

[jagans]

Re: Flywheel Removal on 1968 9.8HP Merc 110

Making a flywheel puller is pretty easy. All you need is a small piece of plate steel 1/4 inch or thicker and a few bolts. I picked up a 2 pack of 1/4 inch thick leaf spring retainer plates at Tractor supply for 8 bucks and the bolts I needed for a few bucks more. The thread size on my flywheel for the three puller bolts is 5/16-24TPI. You need three of these, and one 1/2 inch bolt, flat washer and nut for the center puller bolt. I bought Grade 8 bolts. Heres the drill:

1. Remove the pulll start unit by removing three 1/4 inch cap screws that hold it down.

2. Remove the 5/8" RH threaded Flywheel Nut. Mine came off easy, but if yours dosent, just smack your wrench with a hammer a couple of times, or place some type of hold back bar across the castleations on the top of the flywheel.

3. Take a pencil and paper and take a rubbing of the puller hole pattern on top of the flywheel, If you take a piece of paper about 4 x 4 inches and cut a quarter sized hole in the middle, the paper will lay flat on the flywheel for your rubbing.

4. Tape or stick the paper to your metal plate, then drill three 5/16 or 11/32 holes through the plate. If you bought a plate like I did with a half inch hole in the center, center your pattern on that hole. If not, drill a 1/2 inch hole centered on the pattern.

5. Attach the plate to the flywheel with the three 5/16-24 x 1.5 inch bolts you bought along with your plate at tractor supply, or other hardware store.

6. Grind a centered taper on the 1/2 inch bolt you bought. This will keep the puller bolt centered.

7. Holding a large flat washer and a half inch nut under the center hole, screw in the 1/2 inch bolt until it pulls everything up tight.

8. Make sure all the 5/16 bolts are evenly tightened, and into the flywheel at least 1/2 inch.

9. Now tighten down the 1/2 inch bolt while holding the nut underneath. Once it is pretty tight, give the bolt a tap with a steel hammer.

The flywheel should pop right off.

 

[bruceb58]

Re: Flywheel Removal on 1968 9.8HP Merc 110

Jagans,

You are posting to a

7 YEAR Old THREAD

 

[insitebldrs]

Re: Flywheel Removal on 1968 9.8HP Merc 110

Jagans

Thanks for the step by step tip...!

/D